21000212201020 has 96 divisors (see below), whose sum is σ = 50975337667968. Its totient is φ = 7197841170432.

The previous prime is 21000212201009. The next prime is 21000212201027. The reversal of 21000212201020 is 2010221200012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000212201027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32219664 + ... + 32864983.

It is an arithmetic number, because the mean of its divisors is an integer number (530993100708).

Almost surely, 2^{21000212201020} is an apocalyptic number.

21000212201020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21000212201020 is an abundant number, since it is smaller than the sum of its proper divisors (29975125466948).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21000212201020 is a wasteful number, since it uses less digits than its factorization.

21000212201020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65084759 (or 65084757 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21000212201020 its reverse (2010221200012), we get a palindrome (23010433401032).

The spelling of 21000212201020 in words is "twenty-one trillion, two hundred twelve million, two hundred one thousand, twenty".